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datex2.py
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datex2.py
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# -*- coding: utf-8 -*-
from lxml import etree
import io
import datetime
import pytz
import logging
import geofence
import util
log = logging.getLogger("geofencebroker")
def create_doc(vegobjekt):
doc = Datex2()
name = geofence.get_name(vegobjekt)
nvdb_id = vegobjekt["id"]
version = geofence.get_version(vegobjekt)
polygon = geofence.get_polygon(vegobjekt)
polygon = [[float(j) for j in i] for i in polygon]
centroid = util.get_polygon_centroid(polygon)
doc.body(name, nvdb_id, version, polygon, centroid)
log.debug(u"Creating new Datex2 document: name={}, nvdb_id={}, version={}".format(
name, nvdb_id, version))
return doc
def create_doc_from_db(geofence, delete=False):
"""Constructs a valid Datex2 XML doc from the geofence
object in our database.
If delete is True, then the Datex2 object will not contain any
polygon points to indicate that the Datex2 object is deleted.
"""
doc = Datex2()
name = geofence.get("name")
nvdb_id = geofence.get("id")
version = geofence.get("version")
polygon = util.parse_polygon(geofence.get("polygon"))
polygon = [[float(j) for j in i] for i in polygon]
centroid = util.get_polygon_centroid(polygon)
if delete:
polygon = []
doc.body(name, nvdb_id, version, polygon, centroid)
log.debug(u"Creating new Datex2 document from DB: name={}, nvdb_id={}, version={}".format(
name, nvdb_id, version))
return doc
def create_delete_doc_from_db(geofence):
return create_doc_from_db(geofence, delete=True)
class Datex2:
def __init__(self):
self._file = io.StringIO()
self.top_root = etree.Element("d2LogicalModel",
attrib={"modelBaseVersion": "2"},
nsmap={None: "http://datex2.eu/schema/2/2_0"})
self.doc = etree.ElementTree(self.top_root)
exchange = etree.SubElement(self.top_root, "exchange")
supplierId = etree.SubElement(exchange, "supplierIdentification")
etree.SubElement(supplierId, "country").text = "no"
etree.SubElement(supplierId, "nationalIdentifier").text = "Norwegian Public Roads Administration"
self.root = etree.SubElement(self.top_root, "payloadPublication", attrib={"lang": "en"})
self._qname = etree.QName("http://www.w3.org/2001/XMLSchema-instance", "type")
self.root.set(self._qname, "PredefinedLocationsPublication")
self._header()
def _header(self):
"""
Construct the standard Datex2 header
"""
pubTime = etree.SubElement(self.root, "publicationTime")
tz = pytz.timezone("Europe/Oslo")
pubTime.text = datetime.datetime.now(tz).isoformat()
pubCreator = etree.SubElement(self.root, "publicationCreator")
etree.SubElement(pubCreator, "country").text = "no"
etree.SubElement(pubCreator, "nationalIdentifier").text = "Norwegian Public Roads Administration"
headerInformation = etree.SubElement(self.root, "headerInformation")
etree.SubElement(headerInformation, "confidentiality").text = "noRestriction"
etree.SubElement(headerInformation, "informationStatus").text = "real"
def body(self, name, nvdb_id, version, polygon, centroid):
# Temporary storing of polygon
gps_coords_poly = [util.utm_to_gps(i) for i in polygon]
# Add meta information
self._locationContainer(name, nvdb_id, version, gps_coords_poly)
self.polygon = gps_coords_poly
log.debug("polygon: {}".format(polygon))
log.debug("gps coords: {}".format(gps_coords_poly))
# Calculate centroid of the polygon
# self.centroid = geofence.get_polygon_centroid(polygon)
self.centroid = centroid
log.debug("Datex2 centroid: {}".format(self.centroid))
self.centroid = util.utm_to_gps(self.centroid)
self.name = name
self.nvdb_id = nvdb_id
self.version = version
def _locationContainer(self, name, nvdb_id, version, polygon):
"""
Adds the <predefinedLocationContainer> XML tag block
"""
predefinedLocationCont = etree.SubElement(self.root, "predefinedLocationContainer",
attrib={
"id": unicode(nvdb_id),
"version": unicode(version)
})
predefinedLocationCont.set(self._qname, "PredefinedLocation")
predefLocContName = etree.SubElement(predefinedLocationCont, "predefinedLocationName")
locationBlockValues = etree.SubElement(predefLocContName, "values")
etree.SubElement(locationBlockValues, "value").text = name
self._locationArea(predefinedLocationCont, polygon)
def _locationArea(self, parent, polygon):
"""
Constructs the polygon XML definitions based on the geofence Polygon
coordinates from NVDB.
"""
loc = etree.SubElement(parent, "location")
loc.set(self._qname, "Area")
areaExt = etree.SubElement(loc, "areaExtension")
openlrExtArea = etree.SubElement(areaExt, "openlrExtendedArea")
openrlAreaLocRef = etree.SubElement(openlrExtArea, "openlrAreaLocationReference")
openrlAreaLocRef.set(self._qname, "OpenlrPolygonLocationReference")
openrlPolygonCorners = etree.SubElement(openrlAreaLocRef, "openlrPolygonCorners")
for p in polygon:
# Assume 'p' is a tuple of (lat,lon) coord
coord = etree.SubElement(openrlPolygonCorners, "openlrCoordinate")
lat = etree.SubElement(coord, "latitude")
lat.text = str(p[0])
lon = etree.SubElement(coord, "longitude")
lon.text = str(p[1])
def __str__(self):
return etree.tostring(self.doc, pretty_print=True)